<![CDATA[Log viewer performance does not scale well]]>If an app outputs a reasonable volume of logging (let's say, a few hundred lines), the performance of a browser tab viewing those logs seems to bog down pretty seriously over time.

I don't know for sure how the viewer is implemented, but if it's trying to keep the entire log content loaded, that might be a problem with some more chatty apps. And if it's trying to keep it all in the DOM, that's also perhaps a problem.

I imagine this isn't an easy problem to solve, just thought I'd report it 🙂

(I'm using Firefox if it matters).

]]>https://forum.cloudron.io/topic/4918/log-viewer-performance-does-not-scale-wellRSS for NodeSun, 12 Apr 2026 09:19:04 GMTFri, 16 Apr 2021 12:12:27 GMT60<![CDATA[Reply to Log viewer performance does not scale well on Fri, 16 Apr 2021 17:24:11 GMT]]>@girish lol, "Just do it!" 😉

]]>https://forum.cloudron.io/post/29899https://forum.cloudron.io/post/29899Fri, 16 Apr 2021 17:24:11 GMT<![CDATA[Reply to Log viewer performance does not scale well on Fri, 16 Apr 2021 17:18:37 GMT]]>@robi we have the time tag too (it's on each line) . we just have to sort it, but it's not annoyed me enough yet to do it 🙂

]]>https://forum.cloudron.io/post/29898https://forum.cloudron.io/post/29898Fri, 16 Apr 2021 17:18:37 GMT<![CDATA[Reply to Log viewer performance does not scale well on Fri, 16 Apr 2021 17:09:05 GMT]]>@girish sounds like you need a time tag to help sync the previous logs too. Like the "clap" used in in audio/video.

Or perhaps be even more clever, and cat the files into a temp file thats aligned, which is then appended by the tail -f.

Using a ring buffer to avoid excessive memory usage.

]]>https://forum.cloudron.io/post/29896https://forum.cloudron.io/post/29896Fri, 16 Apr 2021 17:09:05 GMT<![CDATA[Reply to Log viewer performance does not scale well on Fri, 16 Apr 2021 16:53:00 GMT]]>@robi yes. they are in different files - app.log and apptask.log . we were lazy and just do tail -f apptask.log app.log . But what needs to happens is to read each file line by line and order the log lines based on the timestamp. This is only a problem for content already existing in the log files. When new log lines get added, it will interleave correctly (because of how tail works).

]]>https://forum.cloudron.io/post/29893https://forum.cloudron.io/post/29893Fri, 16 Apr 2021 16:53:00 GMT<![CDATA[Reply to Log viewer performance does not scale well on Fri, 16 Apr 2021 16:47:59 GMT]]>@girish said in Log viewer performance does not scale well:

On a side note, I also don't like that the apptask logs and app logs are interleaved and thus appear out of order. This is mostly a limitation of our logging system.

can they be tagged differently?

]]>https://forum.cloudron.io/post/29891https://forum.cloudron.io/post/29891Fri, 16 Apr 2021 16:47:59 GMT<![CDATA[Reply to Log viewer performance does not scale well on Fri, 16 Apr 2021 16:46:50 GMT]]>I run into this often in development. In fact, sometimes it freezes firefox entirely 🙂

On a side note, I also don't like that the apptask logs and app logs are interleaved and thus appear out of order. This is mostly a limitation of our logging system.

]]>https://forum.cloudron.io/post/29890https://forum.cloudron.io/post/29890Fri, 16 Apr 2021 16:46:50 GMT<![CDATA[Reply to Log viewer performance does not scale well on Fri, 16 Apr 2021 16:46:38 GMT]]>How can we get the equivalent of a a tail -n 200 + tail -fas the input to the log viewer?

]]>https://forum.cloudron.io/post/29889https://forum.cloudron.io/post/29889Fri, 16 Apr 2021 16:46:38 GMT<![CDATA[Reply to Log viewer performance does not scale well on Fri, 16 Apr 2021 13:24:36 GMT]]>@robin This is exactly how it is implemented and indeed not very smart but simple. I've done a couple of basic approaches to fix this, but it gets hard quickly and thus resorted to "just reload the browser for now"

Also as a workaround during app packaging, where one might want to keep a long backlog, using the cloudron logs -f in a native terminal will nearly always be better.

]]>https://forum.cloudron.io/post/29875https://forum.cloudron.io/post/29875Fri, 16 Apr 2021 13:24:36 GMT